Dragons not in Dragon Book

These dragons have been released in the game, but for whatever reason haven't been added to the Dragon Book at this time.

Ancient: Was released accidentally in a Black Friday/Cyber Monday sale. No graphics, it is an invisible dragon for those who have it.

Butterfly: There are two versions of the Butterfly dragon. One is breedable, the other is a prize for playing Social Empires to level 20. The Breedable one is now the one in the Dragon Book. (For a long time it was the other way around.)

Cool Fire: Like Butterfly, Cool Fire has 2 versions. The first is breedable. The second "special" Cool Fire was available as a reward for those who started playing on mobile. It was replaced in this regard by Elements, and now is only available in Common Dragon Card Packs. The breedable one is the one in the Dragon Book.